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Vulnerability is a level 66 Magic spell. When cast on an opponent, their defence level is reduced by 10%. The spell gives 76 Magic experience per cast and requires 1 Soul, 5 Earth, and 5 Water runes to be cast. The spell can only be cast if his stats haven't already been lowered, meaning you cannot stack stat reduction with multiple spells in a row.

Remember, you cannot use Ancient Magicks or Lunar spells if you are using standard spells.

Cost

Spell cost
InputCost
5Water rune5Earth rune1Soul rune198
Combo runes
5Water rune1Soul rune5Dust rune188
1Soul rune5Mud rune1,173
5Water rune1Soul rune5Lava rune193
5Earth rune1Soul rune5Steam rune548
5Earth rune1Soul rune5Mist rune403
Staves
5Earth rune1Soul runeStaff of water173
5Water rune1Soul runeStaff of earth173
5Earth rune1Soul runeMist battlestaff173
5Earth rune1Soul runeKodai wand173
5Water rune1Soul runeDust battlestaff173
1Soul runeMud battlestaff148
5Water rune1Soul runeLava battlestaff173
5Earth rune1Soul runeSteam battlestaff173